Camshaft Timing Chain And Sprocket Cleaning And Inspection

WARNING: This page is about a different variant/trim than selected.

Fig 1: Camshaft Timing Chain and Sprocket

Courtesy of GENERAL MOTORS COMPANY

Callout	Component Name
1	Timing Chain Procedure Inspect the timing chain for binding or worn links. Inspect the timing chain for loose links. Inspect the timing chain for loose pins. Replace the timing chain if binding, excessive wear, or a loose condition is present.
2	Timing Chain Guide Procedure Inspect the guide for worn guide surface. Replace the timing chain guides if wear exceeds 1.12 mm (0.045 in) depth on the chain guide surface. Inspect the guide for a cracked or broken guide surface. Inspect the guide for a cracked or damaged guide base. Replace the guide if damage is present.
3	Camshaft Position Actuator Assembly - Exhaust Procedure Inspect the camshaft actuator faces for signs of movement. Inspect the camshaft actuator for sprocket damage. Inspect the actuator bolt seating and sealing inner hub flange for damage. Inspect the back of the actuator for locating pin damage. Ensure the actuator housing bolts are not loose or missing. Inspect the back of the actuator for blockage to the oil passages. Replace the actuator if any of these conditions are present.
4	Timing Chain Guide Procedure Inspect the guide for wear to the guide surface. Inspect the guide for cracked or broken guide surface or base. Replace the guide if these conditions are present.
5	Timing Chain Oil Nozzle Procedure Inspect the oil nozzle body for collapse or cracks at the bolt boss. Discard and replace the oil nozzle body if it is damaged. Verify oil nozzle oil flow with compressed air. Replace the nozzle if damage or oil flow restriction is present.
6	Timing Chain Tensioner Shoe Procedure Inspect for worn, cracked, or broken shoe surface. Inspect the shoe for wear at the tensioner contact pad. Replace the shoe if any of these conditions are present.
7	Timing Chain Tensioner Procedure Inspect the tensioner for damage to the plunger-to-shoe contact surface. Inspect the tensioner for a locked or binding condition. Reset the plunger and ensure the plunger moves freely in and out of the tensioner body. If the tensioner has a lever on the front, press down on the lever and depress the plunger. Insert a suitable tool into the hole in the tensioner body to hold the plunger in the retracted position. If the tensioner has a retaining clip, press the clip and depress the plunger. Insert a suitable tool into the hole in the tensioner body to hold the plunger in the retracted position. Inspect the timing chain tensioner gasket for damage. Replace the tensioner if any of these conditions are present.
8	Camshaft Position Actuator Assembly - Intake Procedure Inspect the camshaft actuator faces for signs of movement. Inspect the camshaft actuator for sprocket damage. Inspect the actuator bolt seating and sealing inner hub flange for damage. Inspect the back of the actuator for locating pin damage. Ensure the actuator housing bolts are not loose or missing. Inspect the back of the actuator for blockage to the oil passages. Replace the actuator if any of these conditions are present.